Power Engineer Third Class Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A power engineer operating a high-pressure boiler must understand
that the primary purpose of a boiler safety valve is to:
A. Increase steam pressure during operation
B. Reduce boiler water temperature
C. Prevent excessive pressure buildup by releasing steam automatically
D. Improve combustion efficiency
The safety valve is a critical boiler protection device designed to open
automatically when pressure exceeds a predetermined safe limit,
preventing catastrophic failure.
2. In a steam boiler, the function of a feedwater pump is to:
A. Remove dissolved gases from steam
B. Supply water to the boiler at a pressure higher than the boiler operating
pressure
C. Increase the temperature of combustion air
D. Control the steam turbine speed
The feedwater pump forces treated water into the boiler against the
internal boiler pressure so steam generation can continue safely.
, 3. The main purpose of boiler water treatment is to:
A. Increase fuel consumption
B. Reduce steam pressure
C. Prevent scale formation and corrosion inside the boiler system
D. Increase the size of steam bubbles
Proper water treatment removes impurities and controls chemical
conditions, reducing deposits and corrosion that damage boiler
components.
4. A boiler operator observes a low water level alarm. The most
appropriate immediate action is to:
A. Increase firing rate
B. Ignore the alarm if steam pressure is normal
C. Determine the cause and follow emergency procedures to protect the
boiler
D. Close all safety valves
Low water conditions can expose heating surfaces and cause severe
overheating, requiring immediate investigation and corrective action.
5. The term “saturated steam” refers to steam that:
A. Contains no water molecules
B. Is always at atmospheric pressure
C. Exists at the boiling temperature corresponding to its pressure
D. Has been heated far above its saturation temperature
Saturated steam is in equilibrium with liquid water at a specific pressure
and temperature relationship.
6. The primary function of a boiler burner management system is to:
A. Increase boiler pressure beyond limits
B. Control safe startup, operation, and shutdown of combustion
, equipment
C. Remove impurities from feedwater
D. Lubricate rotating machinery
A burner management system provides automatic safety checks and
prevents unsafe fuel ignition or combustion conditions.
7. A steam trap is installed in a steam system to:
A. Increase steam pressure
B. Add moisture to steam
C. Remove condensate while preventing unnecessary steam loss
D. Reduce boiler capacity
Steam traps allow condensate and non-condensable gases to leave the
system while retaining valuable steam.
8. The purpose of a boiler blowdown operation is to:
A. Increase dissolved solids in boiler water
B. Remove concentrated impurities from boiler water
C. Increase fuel pressure
D. Stop steam production permanently
Blowdown controls dissolved solids and contaminants that accumulate
during evaporation, helping maintain boiler efficiency and reliability.
9. A pressure gauge installed on a boiler should be:
A. Located where it cannot be seen
B. Used only during shutdown
C. Connected so the operator can accurately monitor boiler pressure
D. Installed after the safety valve only
A pressure gauge provides continuous indication of boiler pressure,
allowing operators to maintain safe operating conditions.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A power engineer operating a high-pressure boiler must understand
that the primary purpose of a boiler safety valve is to:
A. Increase steam pressure during operation
B. Reduce boiler water temperature
C. Prevent excessive pressure buildup by releasing steam automatically
D. Improve combustion efficiency
The safety valve is a critical boiler protection device designed to open
automatically when pressure exceeds a predetermined safe limit,
preventing catastrophic failure.
2. In a steam boiler, the function of a feedwater pump is to:
A. Remove dissolved gases from steam
B. Supply water to the boiler at a pressure higher than the boiler operating
pressure
C. Increase the temperature of combustion air
D. Control the steam turbine speed
The feedwater pump forces treated water into the boiler against the
internal boiler pressure so steam generation can continue safely.
, 3. The main purpose of boiler water treatment is to:
A. Increase fuel consumption
B. Reduce steam pressure
C. Prevent scale formation and corrosion inside the boiler system
D. Increase the size of steam bubbles
Proper water treatment removes impurities and controls chemical
conditions, reducing deposits and corrosion that damage boiler
components.
4. A boiler operator observes a low water level alarm. The most
appropriate immediate action is to:
A. Increase firing rate
B. Ignore the alarm if steam pressure is normal
C. Determine the cause and follow emergency procedures to protect the
boiler
D. Close all safety valves
Low water conditions can expose heating surfaces and cause severe
overheating, requiring immediate investigation and corrective action.
5. The term “saturated steam” refers to steam that:
A. Contains no water molecules
B. Is always at atmospheric pressure
C. Exists at the boiling temperature corresponding to its pressure
D. Has been heated far above its saturation temperature
Saturated steam is in equilibrium with liquid water at a specific pressure
and temperature relationship.
6. The primary function of a boiler burner management system is to:
A. Increase boiler pressure beyond limits
B. Control safe startup, operation, and shutdown of combustion
, equipment
C. Remove impurities from feedwater
D. Lubricate rotating machinery
A burner management system provides automatic safety checks and
prevents unsafe fuel ignition or combustion conditions.
7. A steam trap is installed in a steam system to:
A. Increase steam pressure
B. Add moisture to steam
C. Remove condensate while preventing unnecessary steam loss
D. Reduce boiler capacity
Steam traps allow condensate and non-condensable gases to leave the
system while retaining valuable steam.
8. The purpose of a boiler blowdown operation is to:
A. Increase dissolved solids in boiler water
B. Remove concentrated impurities from boiler water
C. Increase fuel pressure
D. Stop steam production permanently
Blowdown controls dissolved solids and contaminants that accumulate
during evaporation, helping maintain boiler efficiency and reliability.
9. A pressure gauge installed on a boiler should be:
A. Located where it cannot be seen
B. Used only during shutdown
C. Connected so the operator can accurately monitor boiler pressure
D. Installed after the safety valve only
A pressure gauge provides continuous indication of boiler pressure,
allowing operators to maintain safe operating conditions.
